25 dollars to quarters

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

Gymnast always perform on padded mats. how does the mats protect the gymnast

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)